diff --git a/renderdoc/os/win32/win32_hook.cpp b/renderdoc/os/win32/win32_hook.cpp
index ca17c4be39..629ce50e67 100644
--- a/renderdoc/os/win32/win32_hook.cpp
+++ b/renderdoc/os/win32/win32_hook.cpp
@@ -761,7 +761,7 @@ static bool OrdinalAsString(void *func)
   return uint64_t(func) <= 0xffff;
 }
 
-FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, LPCSTR func)
+FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, const LPCSTR func)
 {
   if(mod == NULL || func == NULL || mod == s_HookData->ownmodule)
     return GetProcAddress(mod, func);
@@ -807,6 +807,8 @@ FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, LPCSTR func)
       RDCDEBUG("Located module %s", it->first.c_str());
 #endif
 
+      LPCSTR searchFunc = func;
+
       if(OrdinalAsString((void *)func))
       {
 #if ENABLED(VERBOSE_DEBUG_HOOK)
@@ -835,14 +837,14 @@ FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, LPCSTR func)
           return GetProcAddress(mod, func);
         }
 
-        func = it->second.OrdinalNames[ordinal].c_str();
+        searchFunc = it->second.OrdinalNames[ordinal].c_str();
 
 #if ENABLED(VERBOSE_DEBUG_HOOK)
-        RDCDEBUG("found ordinal %s", func);
+        RDCDEBUG("found ordinal %s", searchFunc);
 #endif
       }
 
-      FunctionHook search(func, NULL, NULL);
+      FunctionHook search(searchFunc, NULL, NULL);
 
       auto found =
           std::lower_bound(it->second.FunctionHooks.begin(), it->second.FunctionHooks.end(), search);